Study of Mechanisms of Crystal Growth of Ferroelectric Polymers by Means of Measurement of Nonlinear Dielectric Spectrum

非线性介电谱测量研究铁电聚合物晶体生长机理

• 批准号: 04650003
• 负责人: IKEDA Susumu
• 金额: $ 1.28万
• 依托单位: YAMAGATA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650003/
• 关键词: Ferroelectric Polyjers; Nonlinear Properties; Second Order Dielectric Constant; Third Order Dielectric Constant; Electrostriction; Curie Transition; 非線形誘電率; 分極反転現象; 相転移; ナイロン11; NH伸縮振動; 水素結合; 結晶成長機構; 分極反転; コールコールプロット

Qualitative difference of ferroelectric polymers from ferroelectric ceramics is becoming clearer. Specifically, we observed remarkable polymer effects in phenomena such as formation and reversal of polarization, crystal growth, paraelectric-ferroelectric phase transition. Results of this study are summarized as follows.1) We succeeded in development of a new system to measure exactly and easily nonlinear properties such as electrostriction, second order and third order dielectric constants.2) We foud tha t a second order dielectric constant reflects a polarization state of crystals and a third order dielectric constant reflects the thermodynamical order of the Curite transision, The origin of piezoelectricity in VDF/TrFE copolymers was elucidated by an evaluation of an electrostriction constant.A theory of ferroelectric polymers was proposed. We found that the forroelectric properties of polymer crystals are affected by intermolecular interaction and intramolecular one and those competition.In addition to ferroelectric polymers including VDF, the ferroelectric properties of odd-number nylon were investigated. We found that its ferroelectricity is strongly affected by the hydrogen bonds.

铁电聚合物与铁电陶瓷的定性区别日益明显。具体地说，我们在极化的形成和反转、晶体生长、顺电-铁电相变等现象中观察到了显著的聚合物效应。本研究的结果总结如下：1)我们成功地开发了一种新的系统，能够准确而方便地测量电致伸缩、二阶和三阶介电常数等非线性性质。2)我们发现二阶介电常数反映了晶体的极化状态，三阶介电常数反映了Curite相变的热力学顺序，通过对电致伸缩常数的评估，阐明了VDF/TrFE共聚物的压电性起源。我们发现聚合物晶体的铁电性能受分子间相互作用和分子内相互作用及其竞争的影响。除了包括VDF在内的铁电聚合物外，还研究了奇数尼龙的铁电性质。我们发现它的铁电性受到氢键的强烈影响。

项目成果

Susumu Ikeda Hideshige Suzuki: "Covelation between Fenoelectric Phase Transition and Polarization Reversal Phenomema Observed though Nonlinear Dielectric Anomaly in Fevoelectric Fluoro copolymers" Polymer Journal. 24. 1223-1227 (1992)

Susumu Ikeda Hideshige Suzuki：“通过 Fevoelectric 氟共聚物中的非线性介电异常观察到 Fenoelectric 相变和极化反转现象之间的 Covelation”Polymer Journal。

Susumu Ikeda: "Polarization Reversal Phenomena of Nylon II" Repts.Prog.Polym.Phys.Jpn.35. 361-362 (1992)

Susumu Ikeda：“尼龙 II 的极化反转现象”Repts.Prog.Polym.Phys.Jpn.35。

山口 悦郎・池田 進: "強誘電性高分子の自発分極と自発ひずみの関係" Polymer Preprints,Japan. 41. 4568-4570 (1992)

Etsuro Yamaguchi 和 Susumu Ikeda：“铁电聚合物的自发极化和自发应变之间的关系”，聚合物预印本，日本，41. 4568-4570 (1992)。

Susumu Ikeda: "Nonlinear Mechanical Deformation Occurring with Polarization Reversal in Ferroelectric Polymers" Repts.Prog.Polym.Phys.Jpn.36. 309-312 (1993)

Susumu Ikeda：“铁电聚合物中极化反转发生的非线性机械变形”Repts.Prog.Polym.Phys.Jpn.36。

Susumu Ikeda: "Nonlinear Mechanical deformation Occurring with Polarization Reversal in Ferroelectric Polymers" Repts. Prog. Polym. Phys. Jpn.36. 309-312 (1993)

Susumu Ikeda：“铁电聚合物中极化反转发生的非线性机械变形”Repts。